Direct drive valve force motor with gain shaping provision

Electrical generator or motor structure – Dynamoelectric – Oscillating

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310 90, H02K 3312

Patent

active

050049402

ABSTRACT:
Limited angle torque motor includes a secondary magnetic flux path of relatively small cross-sectional area which increases the rotational and torque gains of the motor in a localized area about the motor null as if the magnetic air gap of the motor were substantially reduced so that when properly matched with a direct drive valve having significant valve overlap, a desired linear valve flow gain can be achieved. As the motor flux increases with applied current, the secondary flux path saturates, whereby further increases in current above a specified level are directed into the main pole structure magnetic flux path as if the secondary flux path did not exist. In one form of the invention, the desired secondary flux path is formed by providing the main magnetic pole structures with one or more small sections which span the magnetic air gap, whereas in another form of the invention, such secondary flux path is provided by placing a magnetic shim against the end faces at one or both ends of the magnetic housing.

REFERENCES:
patent: 2383971 (1945-09-01), Ivy
patent: 3421033 (1969-01-01), Hoffmeyer
patent: 3441760 (1969-04-01), Collens
patent: 4135119 (1979-01-01), Brosens
patent: 4510403 (1985-04-01), Vandelaan et al.

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